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Welcome aboard and enjoy the journey. WRT your comment about more charcoal and a much hotter fire to get going with low&slow-within reason you can never load too much lump. For long duration low&slows you can load to the top of the fire ring.
Now with speeding along to a low&slow cook temperature-don't get too large a fire initially going or when you throttle down the vents you will be dang near snuffing the fire to stop the temperature rise where you want it. Many different approaches to establishing a good burning low&slow fire-but once you get the ceramics heated, it take a long time to cool down. FWIW-